关键词: 磁悬浮转子, 过盈配合, 模型修正, 固有频率, 接触应力

Abstract:

The magnetic suspension rotor assembly usually achieves reliable connection by means of interference fit, and the modal change is an unavoidable problem. To predict accurately on the frequency for first and second order bending natural frequency, the FEM (finite element model) about a flexible magnetic suspension rotor with hot fit was established, and the model was modified based on the equivalent and contact theory. Specifically, the equivalent model transformed the interference problems into the optimization problems of the elastic modulus and moment of inertia, and the contact model considered the interference problems into the initial geometric penetration and was solved by iterative method under the pre-stress. Finally, the simulation analysis has been proved by modal test, and the results showed that the the modified model in modal prediction was better.

Key words: magnetic suspension rotor, interference fit, model updating, natural frequency, contact stress